Illumination Circuit: Procedure

1. Check if the illumination for the display and navigation module display, steering pad switch assembly, glove box or others (hazard switch, etc.) comes on when the light control switch is turned to the head or tail position.

   Result

   Result	Proceed to
   Illumination comes on for all components except steering pad switch assembly.	A
   Illumination comes on for all components except display and navigation module display.	B
   Illumination comes on for all components except display and navigation module display and steering pad switch assembly.	C
   No illumination comes on (display and navigation module display, radio receiver assembly, hazard switch, glove box, etc.).	D

D → See step   8 

C → See step   7 

B → See step   6 

A: Go to next step 

1. Disconnect the J24 spiral cable sub-assembly connector.
   Fig 1: Identifying Spiral Cable Sub-Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J24-12 (IL+2) - Body ground	Light control switch in tail or head	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Spiral Cable Sub-assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the k1 steering pad switch assembly connector.
   Fig 2: Identifying Steering Pad Switch Assembly And Spiral Cable Sub-Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   k1-8 (EAU) - J24-4 (EAU)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right
   k1-5 (IL+2) - J24-12 (IL+2)	Center	Below 1 Ω
   	2.5 rotations to the left
   	2.5 rotations to the right

   NOTE:

   The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Refer to the pages shown in the brackets.

   HINT: 

   • Removal . Refer to REMOVAL
   • Installation . Refer to INSTALLATION
   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Spiral Cable Sub-assembly)
   *2	Steering Pad Switch Side
   *3	Vehicle Side

NG → See step   9 

OK: Go to next step 

1. Disconnect the J100 display and navigation module display connector.
2. Disconnect the J24 spiral cable sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J100-23 (SWG) - J24-4 (EAU)	Always	Below 1 Ω
   J100-23 (SWG) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the k1 steering pad switch assembly connector.
2. Connect a positive (+) lead from the battery to terminal IL+2 and a negative (-) lead from the battery to terminal EAU of the steering pad switch assembly connector.
   Fig 3: View Of Steering Pad Switch Assembly And Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check if the illumination for the steering pad switch assembly comes on.

   OK

   Illumination for the steering pad switch assembly comes on.

   TEXT IN ILLUSTRATION
   
   

   *1

   Component without harness connected (Steering Pad Switch Assembly)

   -

   -

NG → See step   10 

OK → See step   11 

1. Disconnect the J100 display and navigation module display connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J100-12 (ILL+) - Body ground	Light control switch in tail or head	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11 

1. Disconnect the J100 display and navigation module display connector.
2. Disconnect the J35 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J100-11 (ILL-) - J35-9 (ILL-)	Always	Below 1 Ω
   J100-11 (ILL-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   12